diff --git a/07-heaps/Customer.h b/07-heaps/Customer.h
index b186886..a70e117 100644
--- a/07-heaps/Customer.h
+++ b/07-heaps/Customer.h
@@ -27,14 +27,16 @@ public:
     Customer() : year(0), mileage(0), seq(0), name("") {};
 
     Customer(int y, int m, int s, string n) : year(y), mileage(m), seq(s), name(std::move(n)) {
-        priority = mileage / 1000 + year - seq;
-        serial = priority * 100 + (100 - seq);
+        priority = calcPriority();
+        serial = calcSerial();
     };
 
-    int getPriority() const { return priority; }
+    int calcPriority() { return mileage / 1000 + year - seq; }
 
     int getSerial() const { return serial; }
 
+    int calcSerial() { return priority * 100 + (100 - seq); }
+
     friend ostream &operator<<(ostream &os, const Customer &c) {
         os << c.year << " " << c.mileage << " (" << c.getSerial() << ") [" << c.name << "]";
         return os;